target-alpha/sys_helper.c

   1 /*
   2  *  Helpers for system instructions.
   3  *
   4  *  Copyright (c) 2007 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "cpu.h"
  21 #include "helper.h"
  22 #include "sysemu/sysemu.h"
  23 #include "qemu/timer.h"
  24
  25
  26 uint64_t helper_load_pcc(CPUAlphaState *env)
  27 {
  28 #ifndef CONFIG_USER_ONLY
  29     /* In system mode we have access to a decent high-resolution clock.
  30        In order to make OS-level time accounting work with the RPCC,
  31        present it with a well-timed clock fixed at 250MHz.  */
  32     return (((uint64_t)env->pcc_ofs << 32)
  33             | (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));
  34 #else
  35     /* In user-mode, vm_clock doesn't exist.  Just pass through the host cpu
  36        clock ticks.  Also, don't bother taking PCC_OFS into account.  */
  37     return (uint32_t)cpu_get_real_ticks();
  38 #endif
  39 }
  40
  41 /* PALcode support special instructions */
  42 #ifndef CONFIG_USER_ONLY
  43 void helper_hw_ret(CPUAlphaState *env, uint64_t a)
  44 {
  45     env->pc = a & ~3;
  46     env->intr_flag = 0;
  47     env->lock_addr = -1;
  48     if ((a & 1) == 0) {
  49         env->pal_mode = 0;
  50         swap_shadow_regs(env);
  51     }
  52 }
  53
  54 void helper_tbia(CPUAlphaState *env)
  55 {
  56     tlb_flush(env, 1);
  57 }
  58
  59 void helper_tbis(CPUAlphaState *env, uint64_t p)
  60 {
  61     tlb_flush_page(env, p);
  62 }
  63
  64 void helper_halt(uint64_t restart)
  65 {
  66     if (restart) {
  67         qemu_system_reset_request();
  68     } else {
  69         qemu_system_shutdown_request();
  70     }
  71 }
  72
  73 uint64_t helper_get_time(void)
  74 {
  75     return qemu_get_clock_ns(rtc_clock);
  76 }
  77
  78 void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
  79 {
  80     AlphaCPU *cpu = alpha_env_get_cpu(env);
  81
  82     if (expire) {
  83         env->alarm_expire = expire;
  84         qemu_mod_timer(cpu->alarm_timer, expire);
  85     } else {
  86         qemu_del_timer(cpu->alarm_timer);
  87     }
  88 }
  89 #endif /* CONFIG_USER_ONLY */